Error: Route.post() requires a callback function but got a [object Object]

```js
const express = require('express');
const router = express.Router();
const Note = require('../models/Note');
const { body, validationResult } = require('express-validator');
const fetchuser = require('../middleware/fetchuser');

// ROUTE 2: Add a new Note using: POST "/api/notes/addnote". Login required
router.post('/', fetchuser, [
body('title', 'Enter a valid title').isLength({ min: 3 }),
body('description', 'Description must be atleast 5 characters').isLength({ min: 5 }),], async (req, res) => {
try {
const { title, description, tag } = req.body;

// If there are errors, return Bad request and the errors
const errors = validationResult(req);
if (!errors.isEmpty()) {
return res.status(400).json({ errors: errors.array() });
}
const note = new Note({
title, description, tag, user: req.user.id
})
const savedNote = await note.save()

res.json(savedNote)

} catch (error) {
console.error(error.message);
res.status(500).send("Internal Server Error");
}
})

module.exports = router
```